JDBC数据库编程

package com.neusoft.utils;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class JdbcOracleTest {

 /**
  * @param args
  */

 public static void main(String[] args) {

  // 2.建立同数据库的连接
  // url:统一资源定位符
  String url = "jdbc:oracle:thin:@10.25.85.247:1521:orcl";
  String user = "scott";
  String password = "tiger";
  Connection con = null;
  Statement st = null;
  String sql = "select * from DEPT";
  String sql1 = "delete from USERTEST";
  ResultSet rs = null;
  PreparedStatement pst = null;
  // 1.加载驱动
  try {
   Class.forName("oracle.jdbc.driver.OracleDriver");
   con = DriverManager.getConnection(url, user, password);
   System.out.println("数据库连接成功！");
   // 取消自动提交事务
   con.setAutoCommit(false);

   // 3.取得statement对象
   st = con.createStatement();
   // 4.发送statement到oracle中，并且查询表
   rs = st.executeQuery(sql);
   // 5.取出结果集中的数据
   while (rs.next()) {
    System.out.println("*************************");
    String deptno = rs.getString(1);
    System.out.println(deptno);
    String dname = rs.getString(2);
    System.out.println(dname);
    String loc = rs.getString(3);
    System.out.println(loc);
    System.out.println("*************************");
   }
   // 6.删除数据
   // int i = st.executeUpdate(sql1);
   // System.out.println("删除的记录的条数："+i);

   // 7.高级-->?占位符
   pst = con.prepareStatement("insert into USERTEST values(?,?,?)");
   // 给占位符赋值-->通过serXxx()方法
   pst.setString(1, "5");
   pst.setString(2, "u5");
   pst.setString(3, "p5");
   int i = pst.executeUpdate();
   System.out.println("插入的记录的条数：" + i);
   //事务处理-->提交
   con.commit();

  } catch (ClassNotFoundException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  } catch (SQLException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
   try {
    //事务处理-->回滚
    con.rollback();
   } catch (SQLException e1) {
    // TODO Auto-generated catch block
    e1.printStackTrace();
   }
  }

  // 6.关闭资源
  try {
   if (rs != null) {
    rs.close();
   }

  } catch (SQLException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
  try {
   if (st != null) {
    st.close();
   }
  } catch (SQLException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }

  try {
   if (pst != null) {
    pst.close();
   }
  } catch (SQLException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }

  try {
   if (con != null) {
    con.close();
   }
  } catch (SQLException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
 }

}